AirHint found the following cheapest return flights from San Diego (SAN) to Dublin (DUB) in December 2025 (see full year).

Return flights

09 Dec - 16 Dec	Air France
23 Dec - 09 Jan	Air Canada
03 Dec - 09 Dec	United
24 Dec - 11 Jan	United
06 Dec - 13 Dec	Aer Lingus
08 Dec - 15 Dec	Aer Lingus
17 Dec - 10 Jan	Frontier Airlines
22 Dec - 17 Jan	Air Canada
10 Dec - 17 Dec	Alaska Airlines
23 Dec - 07 Jan	Air Canada
20 Dec - 09 Jan	Delta
04 Dec - 11 Dec	Aer Lingus
16 Dec - 07 Jan	Iberia
12 Dec - 19 Dec	Aer Lingus
30 Dec - 06 Jan	Aer Lingus
21 Dec - 10 Jan	United
20 Dec - 10 Jan	Alaska Airlines
14 Dec - 21 Dec	Alaska Airlines
23 Dec - 31 Dec	Air France
20 Dec - 27 Dec	Aer Lingus

Also check the deals for one-way flights from San Diego to Dublin in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from San Diego to Dublin in December from $424

Return flights